Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 96,258	$ 32,533
Restricted cash, short-term		21
Accounts receivable, net of allowance for doubtful accounts of $960 and $1,050 as of September 30, 2013 and December 31, 2012, respectively	39,413	36,011
Prepaid expenses and other current assets	1,801	953
Total current assets	137,472	69,518
Long-term assets:
Restricted cash, long-term	600	1,200
Property and equipment, net of accumulated depreciation of $3,342 and $3,077 as of September 30, 2013 and December 31, 2012, respectively	2,833	1,995
Intangible assets, net of accumulated amortization of $13,972 and $10,315 as of September 30, 2013 and December 31, 2012, respectively	21,728	25,385
Goodwill	29,719	29,719
Deferred tax assets, long-term	1,695	1,695
Other long-term assets	198	211
Total long-term assets	56,773	60,205
Total assets	194,245	129,723
Current liabilities:
Accounts payable and accrued expenses	30,092	21,075
Deferred rent and security deposits payable	746	627
Deferred revenue	194	210
Deferred tax liabilities, short-term	1,695	1,695
Amount outstanding under credit facility and accrued interest expenses		6,019
Total current liabilities	32,727	29,626
Warrants for purchase of mandatorily redeemable convertible preferred stock		1,103
Total liabilities	32,727	30,729
Commitments and contingencies
Mandatorily redeemable convertible preferred stock		162,466
Stockholders' equity (deficit):
Additional paid-in capital	266,362	17,752
Accumulated other comprehensive income	245	345
Accumulated deficit	(105,094)	(81,570)
Total stockholders' equity (deficit)	161,518	(63,472)
Total liabilities, mandatorily redeemable securities and stockholders' equity (deficit)	194,245	129,723
Common stock
Stockholders' equity (deficit):
Common stock	5	1
Series II common stock
Stockholders' equity (deficit):
Common stock